Rotary pump or motor



Aug. 13, 1957 E. H. GARwooD 2,802,426

ROTARY PUMP OR MOTOR Filed March 15. 1956 UnitedStates Patent zgs'ozgzRo'rARY PUMP on MOTOR Ernest H. Garwood, Long Beach, Calif.

Application March 15, 1956, Serial No. 571,685

1 Claim. (Cl. 10S- 162) This invention relates to a novel pump or motorof the rotary type, and in which the valving structure between the rotorand the body of the 'pump or motor consists of a portion of the bodyitself against which the rotor is accurately fitted, thus eliminatingall additional valve structures which might otherwise be required.

Another object of my invention is to provide a novel arrangement ofcylinders within the rotor and a pair of pistons in each cylinderwhereby an opposed piston construction is provided, thus producinggreater balance in the motor or pump eliminating vibration to a largeextent.

Another object of my invention is to provide a novel means ofreciprocating the pistons in the rotor by means of an internal cam trackwithin the body of the pump or motor. Y

Still another object of my invention is to provide a novel pump or motorof the character stated, in which there are a minimum number of parts,and thus also producing a pump or motor which is ecient and which willoperate to produce a `considerable amount of power per pound of weight.

Other objects, advantages and features of invention may appear from theaccompanying drawing, the `subjoined detailed description and theappended claims.

In the drawing:

Figure 1 is a vertical sectional view taken on line 1-1 of Figure 3.

Figure 2 is a sectional view taken in line 2--2 of Figure 3. n

Figure 3 is a sectional view taken on line 3--3 of Figure 1.

Referring more particularly to the drawing, my motor or pump consists ofa housing or body 1 which includes two complementary units 2 and 3. Theunits 2 and 3 are bolted together by means of the matching peripheralflanges 4, substantially as shown. The units 2 and 3 are hollow, thatis, they yare substantially cup-shaped, and the unit 2 is provided witha central annular hub 5. The hub 5 projects inwardly and the purpose ofthis hub will be subsequently described. The periphery of the hub is.accurately machined for the purpose of receiving the rotor, as will besubsequently described. The part 3 is formed with a cam track 6 on theinside thereof and this cam track is formed with two or more high lobes,as well as two or more low lobes, for the purpose of causingreciprocation of the pistons ywithin the rotor, as will be subsequentlydescribed. The part 2 is provided with a similar cam track 7 which isidentical in shape to the cam track 6, and the high and lowlobes of thetwo cam tracks are arranged opposite each other fora purpose 2,802,426MPatented Aug. 13, 1957 ICC eryl of the hub 5 and are thus adjacent tothe rotor, as will besubsequently described. ,j

Y j A rotor 16is mounted on aushaft 17,"which i'sisuitably journaledinthe `hub 5 of the-housing 1, substantially as shown. ,Thqrotor 16 -isformed withan annular peripheral ring fportion 18, which will betermedzthe cylinder portion of the rotor. The inner surface of thecylinder portion of the rotor is accurately machined to t the outermachined surface of hub 5. Thus the adjacent moving part of the rotor 16to the hub 5 is so constructed that it will effectively seal off againstthe hub, thus preventing leakage between the hub and the rotor at thispoint. The outer peripheral surface of the rotor 16 may also beaccurately machined to iit the inside of the complementary housing parts2 and 3. The cylinder portions 18 of the rotor 16 l are formed with aplurality of peripherally arranged and laterally extending cylinders 19,and each cylinder extends transverselyl through the cylinderportion 18of the rotor. In each cylinder 19 I provide a pair of pistons 20--21which are thus opposed and the pistonsA are reciprocally mounted in thecylinders and move laterally with respect to the rotor 16. Reciprocationof the pistons 20--21 is accomplished by means of the cam tracks 6 and'7. Each piston is provided with a finger 22 which projects from theouter end of each piston and extends around the back of the cam track 6and 7. An appropriate bearing or ball 23 on the nger 22 reduces frictionof the finger against the actuating cam. Similarly, a bearing or ball 24on the end of each piston bears against the inner llat face of therespective cams 6 or l7, thus causing the pistons to be reciprocated asthe rotor 16 moves with relation to the cam tracks 6 and 7. Theinnermost surface of each of the cams 6 and 7 move the pistons in onedirection, while the fingers 22 move the pistons in the oppositedirection. This is evident since both the innermost and outermost camsurfaces of the cam tracks 6 and 7 are both engaged by each of thepistons. The cam tracks 6 and 7 are, furthermore, so arranged as totheir high and low points or lobes that the pairs of pistons 20-21 ineach cylinder 19 will be moved inwardly and outwardly together, thuscreating a pumping action within the respective cylinders, or if a fluidpressure is exerted on 'the intake ducts a rotating force will beexerted on the rotor 16. Each cylinder 19 is provided with an outletport 25 which permits air or fluid to move into the fan-shaped ports 15and thence to the outlet ducts.

.In operation- Assuming that the device is to be used as Va pump, powerisapplied to the shaft 17 which causes the rotor 16 to rotate within thehousing 1. The cam tracks 6 and 7 are stationary and, consequently, asthe rotor 16 moves with relation to the cam tracks the pistons 20 and 21will be reciprooated Within the cylinders 19, since the pistons engageboth the outer and the inner cam surfaces of the tracks 6 and 7.Reciprocation of the pistons 20 and 21 will cause fluid to be pumpedthrough the outlets 25, thence into the ports 14-15 and out through theducts 12 and 13., This is accomplished on the inward movement ofthepistons 20 and 21. Theout- Y ward movement of the pistons willeause`fluid to be drawn A rotary pump or motor comprising a housingl in-vcluding two complementary units, a hub on one of said to be subsequentlydescribed. The hub 5 is formed with two or more intake ducts 8 and 9which are drilled in the hub and extend radially outward to anenlarged'fanshaped port 1li-11, respectively. Similarly, a pair ofoutlet ducts 12-13 are drilled in the hub 5 and these outlet ductsextend fromv a similarly fan-shaped port 14 and 15, respectively. All ofthese ports are at the periphunits, a shaftextending into the housingand through said hub, a rotor on' the shaft and positioned within thehousing, saidrotor having an accurate tit on the hub and extending overthe hub, a plurality of peripherally. arranged and longitudinallyextending `cylinders in the rotor, said cylinders extendingentirely`through the rotor and being open at both ends thereof, ai pair ofpistons in each of the cylinders, `one end of each of thepistonsprojecting from the cylinders, a cam track within each of said units,the ports registering with the inlet and outlet ducts succesprojectingend of the pistons engaging said cam track sivel-y as the rotor rotates.

to reciprocate the pistons, a finger projecting'from each piston, saidngers engaging a face of the cam trackwoppo- References Cited in the leof this patent site the 'face' engaged by'the pistons, said hub havingfan- 5 UNITED STATES PATENTS shaped ports at the perlphery thereof andYadjacent sald therein extending from each of the cylinders, said outlet10

